common/os/vm_pageout.c

139  *     for new pageout parameters, fastscan, slowscan, and handspreadpages.
286 	 * stock for pageout's own use.  Having a few such pages
288 	 * pageout needing pages.  When freemem < pageout_reserve,
290 	 * other than pageout and sched.  (At some point we might
294 	 * to the same special dispensation we accord pageout.)
327 	 * Setting fastscan to be 1/2 of memory allows pageout to scan
335 	 * every second and consequently pageout may not be able to free
341 	 * scale with memory to prevent pageout from consuming too much
360 	 * goes from 0 to slowscan (i.e., pageout starts running).  This
362 	 * pageout scans a small number of pages to satisfy the transient
367 	 * In addition to setting fastscan and slowscan, pageout is
380 	 * Also, the processor time used by pageout will vary from ~1%
398 	 * On an MP machine, pageout is often unable to maintain the
401 	 * dirtying memory at a much faster pace than pageout can find
408 	 * The swapper is currently used to free up memory when pageout
442 	 * pageout daemon hands.  The amount of time to reclaim a page
443 	 * once pageout examines it increases with this distance and
447 	 * Since pageout is limited to ~4% of the CPU, setting handspreadpages
451 	 * necessary, by increasing the processor time used by pageout
457 	 * the freelist since pageout does not end up freeing pages which
469 	 * the pageout daemon in which the front hand cleared its ref bit.
487  * times a second.  Nscan records the number of pages pageout has examined
489  * it runs.  Desscan records the number of pages pageout should examine
496 static kmutex_t	pageout_mutex;	/* held while pageout or schedpaging running */
499  * Pool of available async pageout putpage requests.
539 		/* pageout() not running */
615 ulong_t		push_list_size;		/* # of requests on pageout queue */
638  * There are 2 threads that act on behalf of the pageout process.
642  * and the other (pageout) thread is signaled. The pageout thread
645  * operations (like memory) and hence can block the pageout
652 pageout()
665 	bcopy("pageout", PTOU(curproc)->u_psargs, 8);
666 	bcopy("pageout", PTOU(curproc)->u_comm, 7);
669 	 * Create pageout scanner thread
676 	 * for pageout.
687 	/* Create the pageout scanner thread. */
692 	 * kick off pageout scheduler.
698 	 * The kernel cage thread is started under the pageout process
705 	 * Limit pushes to avoid saturating pageout devices.
708 	CALLB_CPR_INIT(&cprinfo, &push_lock, callb_generic_cpr, "pageout");
1089 		 * Queue i/o request for the pageout thread.
1132  * routines on one common list.  This ensures that pageout devices (swap)
1134  * The pageout thread empties this list by initiating i/o operations.
1177  * Wakeup pageout to initiate i/o if push_list is not empty.